My overwintered 1 yr olds always go into 15L pots for their second season. I'll usually try to overwinter five of those plants again - five because that's the max no. of 15L pots I can easily accommodate in my overwintering space in addition to that seasons 1 yr olds of which there are usually about fifteen, each in a 4L pot. I favour the dormant method of overwintering. I'd personally avoid disturbing the root ball at the end of a season as doing so could be either detrimental to the plant's wellbeing or could encourage some new growth when the overwintering environment is not supportive of such. I can't fit 15L pots on my windowsill either, but so long as the compost is kept on the dryer side and the temperature kept cool i.e. heating in that room deactivated, the plants will tolerate being on a desk / table away from the window They'll spend their time cycling between perpetual gloom and darkness on a daily basis; that's fine the plants aren't actually growing, they're just ticking over.
You can root prune of course but like Scarlet says you need to do likewise with the foliage so it balances.
You can root prune of course but like Scarlet says you need to do likewise with the foliage so it balances.
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